you could do the marin trail , but when you cross the road near to the final section head left, takes you up tp lyn crafnant ,follow the road up to blan y nant and take the bridleway over the hill - takes you back into betswy

We stayed in Bewts last October for a couple of nights and did Llandegla (on the drive up), Marin, Penmachno and finally Snowdon on the Monday after the ban had lifted! Furthest we had to travel was Snowdon, which was about 25-30 mins IIRC from Bewts.

Cracking weekend and a good mix of trails. Penmachno (loops 1&2) was our favourite trail in terms of pure enjoyment, but Snowdon was awesome in the "big mountain" experience sense.

I live about 40mins from Betws Y Coed ( its not spelt Bewts Y Coed ) If me and my m8's have 2-3days of back to back riding we do sum ut like this:-

Panmachno loops 1 & 2 (20miles riding), Then go over to Coed Y Brenin the next day and do both the MBR route and also Tarw route back to back (about 40k of the best single track going IMHO)

would possibly do the Marin if the weathers good on the last day(great views) but if its pants i would not bother. As the marin is ok for a ride out but compared to the others its a bit underwhelming, but does offer great views on a clear day. Or go to Llandegla on the last day, folk seem to slag it off but the new black and red routes are great fun if ridden fast enough and combine the 2trails and you have 24 or so miles of great single track, and the shop and cafe is top notch. and its only 5mins from my house

Dont know where you normaly ride, but be prepaired for rough rocky trails in North Wales.

Nice grub at that pub next to the river, on the lane to the Marin start. It would be a fair old jaunt down to Nant-y-Arian from Betws-y, an hours drive I reckon. The MachX, nr Machynlleth is worth stopping off at, if near.